EP0718330A1 - Procédé de fabrication de copolymères blocs radiaux asymétriques et à plusieurs bras - Google Patents

Procédé de fabrication de copolymères blocs radiaux asymétriques et à plusieurs bras Download PDF

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EP0718330A1
EP0718330A1 EP95203599A EP95203599A EP0718330A1 EP 0718330 A1 EP0718330 A1 EP 0718330A1 EP 95203599 A EP95203599 A EP 95203599A EP 95203599 A EP95203599 A EP 95203599A EP 0718330 A1 EP0718330 A1 EP 0718330A1
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polymer
living
butadiene
poly
predominantly
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EP0718330B1 (fr
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Karel Hendrik Leffelaar
Jeroen Van Westrenen
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Shell Internationale Research Maatschappij BV
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F297/00—Macromolecular compounds obtained by successively polymerising different monomer systems using a catalyst of the ionic or coordination type without deactivating the intermediate polymer
    • C08F297/02—Macromolecular compounds obtained by successively polymerising different monomer systems using a catalyst of the ionic or coordination type without deactivating the intermediate polymer using a catalyst of the anionic type
    • C08F297/04—Macromolecular compounds obtained by successively polymerising different monomer systems using a catalyst of the ionic or coordination type without deactivating the intermediate polymer using a catalyst of the anionic type polymerising vinyl aromatic monomers and conjugated dienes
    • C08F297/044—Macromolecular compounds obtained by successively polymerising different monomer systems using a catalyst of the ionic or coordination type without deactivating the intermediate polymer using a catalyst of the anionic type polymerising vinyl aromatic monomers and conjugated dienes using a coupling agent

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  • the invention relates to a process for manufacturing multiarmed asymmetrical radial block copolymers and to multiarmed asymmetrical blockcopolymers obtainable with such a process.
  • the invention relates to a process for manufacturing six armed asymmetrical radial block copolymers, using a functional silicon containing coupling agent and intermediate living polymer arms, initially prepared from a conjugated diene and/or a mono vinyl aromatic monomer, and more in particular styrene, by anionic polymerisation.
  • US patent No. 4010226 disclosed the preparation of branched block copolymers of controlled structure by reacting conjugated diene and/or monoalkenyl arene and/or monoalkenyl pyridine monomer, with monolithium initiator to give monolithium terminated polymer of an average molecular weight of 7500, coupling with a poly(alkenyl compound) and reacting the resulting coupled polylithio intermediate with conjugated diene, monoalkenyl arene and/or monoalkenyl arene and/or alkenyl pyridine monomer at a temperature in the range of some -75°C to + 150°, each polymer branch so formed having an average molecualr weight of from 5000 - 1000,000.
  • the polymers obtained by said process and their hydrogenated derivatives were indicated to be used in footwear, adhesives, wire and cable coatings and automative parts.
  • US patent No. 5,212,249 disclosed a process for preparing asymmetric radial polymers, wherein the different polymeric arms are contacted sequentially with a non polymerisable coupling agent, preferably being a silicon containing coupling agent, having up to 12 functional sites.
  • a non polymerisable coupling agent preferably being a silicon containing coupling agent, having up to 12 functional sites.
  • Contacting in the final step in said process which frequently but not necessarily always will be the second step in the process was carried out in the presence of a polar compound suitable for increasing the amount of vinyl content in a conjugated diolefin polymer during the polymerisation thereof.
  • the polymers obtained according to this process showed a narrower relative arm distribution of the several asymmetric radial polymers produced and a significant increase of the amount of product having the devised ratio of polymeric arms.
  • Non-polymerisable coupling agents having 3 or 4 functional groups were most preferred.
  • Useful polar compounds were selected from ethers, tertiary amines, pyridine and pyrolidene compounds, of which the di- and poly-functional ethers were preferred.
  • Said process was usually carried out in at least two separate reactors, to be used for the initial preparation of the first living polymer arm and the second living polymer arm respectively.
  • an object of the present invention was to provide an economically attractive process for the manufacture of said radial asymmetric block copolymers.
  • the invention relates to a process for the manufacture of multiarmed radial asymmetric block copolymers, comprising of the steps:
  • the first and second living polymer are comprising predominantly poly(conjugated diene) blocks and/or diblocks consisting of a predominantly poly(conjugated diene) block segment, and a predominantly poly(mono vinyl aromatic hydrocarbon), of which the second polymer block shows a significantly varying molecular weight.
  • the blocks involved maybe constituted by a major amount of one monomer, mixed with a minor amount (up to 20 wt %) of another comonomer, e.g. a major fraction of butadiene or isoprene mixed with a minor fraction of styrene, ⁇ -methyl styrene etc or a major fraction of styrene mixed with a minor fraction of 1,3 butadiene or isoprene or mixtures thereof.
  • comonomer mixtures may form tapered block copolymer segments or substantially random copolymer segments, which both may be included as arms in the complete multiarmed asymetric radial block copolymers.
  • the firstly introduced living polymer arms having a narrow molecular weight distribution may be prepared from monomers selected from 1,3-butadiene, isoprene, 2,3-dimethyl 1,3 butadiene, 1,3-pentadiene; 1,3-hexadiene or mixtures thereof, and/or from monomers selected from styrene, alfa-methylstyrene, o-methyl styrene, p-methylstyrene, p-tertbutylstyrene, 1,3-dimethylstyrene, or mixtures thereof.
  • the secondly introduced living polymer arms having a broad molecular weight distribution, may be prepared from at least predominantly 1,3-butadiene, as the last polymerising monomer, optinally preceded by a minor block of monomers selected from styrene, ⁇ -methylstyrene, o-methyl-styrene, p-methylstyrene, p-tertbutylstyrene, 1,3-dimethylstyrene or mixtures thereof, or by a block of branched conjugated diene, such as isoprene.
  • the firstly introduced living arm polymers are selected from substantially pure 1,3-butadiene homopolymers, substantially pure isoprene homopolymers; substantially pure styrene homopolymers and combinations thereof.
  • the secondly introduced living arm polymers are selected from substantially pure 1,3 butadiene homopolymers and combinations of substantially pure 1,3 butadiene homopolymers and substantially pure styrene homopolymers or substantially pure isoprene homopolymers, wherein the poly(1,3-butadiene) block, representing a significant part of the total living polymer arm, must be the last formed.
  • the multiarmed radial asymmetric block copolymers of the present invention comprise a first set of arms, consisting of a block of substantially pure poly(1,3-butadiene) or a block of substantially pure poly(isoprene) or a diblock of a substantially pure poly(styrene), and a substantially pure poly(1,3-butadiene) or substantially pure poly(isoprene), and a second set of arms consisting of substantially pure 1,3-butadiene homopolymer or a diblock of initially prepared substantially pure poly(styrene) and subsequently formed substantially pure poly(butadiene).
  • Preferred organo alkali metal initators for the steps (a) and (c)of the process of the present invention are lithium alkyl or lithium alkoxy compounds, lithium cycloalkyl, lithium alkyl substituted cycloalkyl, lithium phenyl or lithium alkyl substituted phenyl, having from 1 to 20 carbon atoms and preferably from 2 to 8 carbon atoms. More preferably tert-butyl lithium or sec-butyl lithium are used
  • Non polymerisable coupling agents which can in principle be used in step (b) are silicon containing compounds selected from compounds of the formulae X3-Si-SiX 3, X3 Si-O-SiX3, X3 Si-(CH2) n -SiX 3, and the like, wherein X represents halogen, hydride, carboxyl or alkoxy radicals, having from 1 to 4 carbon atoms.
  • X represents halogen, hydride, carboxyl or alkoxy radicals, having from 1 to 4 carbon atoms.
  • BTCSE Si-CH2-CH2SiCl3
  • BTMSE MeO 3 Si-CH2-CH2-Si (OMe)3
  • multiarmed asymmetric radial block copolymers [AC]4X[B]2 are manufactured, using as coupling agent 1,2 bis(trichlorosilyl) ethane (BTCSE), or 1,2-bis(trimethoxy silyl) ethane (BTMSE) by contacting said coupling agent with four initially prepared living poly(butadiene) or poly(isoprene) blocks or diblocks, containing a poly(styrene) and a poly(butadiene) or poly(isoprene) block, leaving two reactive sites available, which are finally reacted with another type of in situ prepared living block copolymer segments as hereinbefore specified, after reactivation of these residual sites with a polar compound, ultimately resulting in a 6 armed asymmetric radial block copolymer.
  • BTCSE bis(trichlorosilyl) ethane
  • BTMSE 1,2-bis(trimethoxy silyl) ethane
  • a one reactor multiarmed asymmetric block copolymer is prepared by a first step preparation of living poly(styrene)-poly(butadiene) diblock segments or living poly(styrene)-poly(isoprene) diblock segments, having a narrow molecular weight distribution; followed by coupling of these intermediate polymers with four of the most reactive coupling sites of 1,2-bis(trichlorosilyl)ethane (BTCSE) and initiation of new poly(butadiene) segments, by means of an alkyllithium initiator such as butyl lithium followed by reactivation of the remaining functional sites of the partially coupled polymer by means of a polar compound and reacting these remaining functional sites.
  • BTCSE 1,2-bis(trichlorosilyl)ethane
  • a two reactor multiarmed asymmetric radial block copolymer [C]4X[AB]2 is prepared by a first preparation of poly(butadiene) or poly(isoprene) living chains and coupled to four sites of BTCSE. Subsequently this coupled intermediate is contacted with living poly(styrene) chains, prepared in a second reactor, and 1,3 butadiene monomer in order to prepare living poly(styrene)-poly(butadiene) arms, wherein the poly(butadiene) segment has a broad molecular weight distribution, and subsequent reacting of the remaining sites of the partially coupled polymer, after reactivation of said sites by means of a polar compound
  • the living polymer segments useful as arms in the process of the present invention may be prepared by contacting the monomer or monomers with organo alkali metal compound in a suitable solvent at a temperature within the range of from -50°C to 150°C and preferably at a temperature within the range of from 0°C to 100°C.
  • the living polymers to be introduced as arms in the process of the present invention are in general contacted with the coupling agent in step (b) at a temperature within the range of from 0°C to 100°C, at a pressure in the range of from 1 bar to 8 bar.
  • step (c) second polymer segments, to be used as a second set of arms in the complete multiarmed radial asymmetric block copolymer and showing significantly varying molecular weights (relative broad molecular weight distribution), are prepared in the presence of the remaining, not reacted functional sites of the coupling reagent, which has reacted already with a first set of arms, having a relatively narrow molecular weight distribution.
  • Said second polymer segments may be prepared from butadiene, by means of added alkyl lithium initiator and more preferably butyl lithium initiator, or of added living separately prepared growing chains, constituted by at least a predominantly poly(monovinyl aromatic) segment, and more in particular poly(styrene) segment.
  • step (d) the one or more polar compounds are added to increase the reactivity of the residual functional groups of the initially reacted coupling agent, i.e. the product of step (b).
  • the polar compounds to be used in step (d) of the process of the present invention to increase the reactivity of the remaining reacting sites of the coupling agent include Lewis bases and more in particular ethers, such as diethyl ether, dibutyl ether, tetrahydrofuran, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dibutyl ether, diethylene glycol dimethyl ether, diethylene glycol di ethylether, diethylene glycol dibutyl ether, dioxane, diethoxy propane, triethylene glycol diethyl ether, 1,2-dimethoxy benzene, 1,2,3-trimethoxy benzene, 1,2,4 trimethoxy benzene, 1,2,3-tri ethoxy benzene, 1,2,3-tributoxy benzene, 1,2,4-triethoxy benzene.
  • ethers such as diethyl ether, dibutyl ether,
  • Preferred polar compounds have been found to be 1,2-diethoxypropane, dioxane, orthodimethoxy benzene and diethylene glycol diethyl ether.
  • the suitable polar compounds will be used at a concentration within the range from 0.001 to 20 wt % and preferably from 10 to 1000 ppm. relative to weight of the reaction mixture.
  • another aspect of the present invention is formed by the novel class of multiarmed radial asymmetric copolymers, obtainable by the hereinbefore specified process and which may be characterised by sets of different arms, one set of which comprising block segments showing a relatively broad molecular weight distribution (Q>1.2), obtainable by in situ preparation of said living arms in the presence of free active sites of a partially reacted coupling agent and another set of which comprising block segments showing a relatively narrow molecular weight distribution (Mw/Mn ⁇ 1.1) originating from the first separate reaction step.
  • both block segments Preferably both block segments have a relatively high 1,4 polymerisation degree ( ⁇ 90%) in case of poly(butadiene).
  • the monoblock polymer segments showing a relatively narrow molecular weight distribution and constituting one set of arms of the radial asymmetric block copolymers, will normally have a weight average molecular weight in the range of from 5000 to 150,000 and preferably within the range of from 10,000 to 70,000.
  • the weight average molecular weight will be within the range of from 20,000 to 250,000 and preferably from 20,000 to 100,000.
  • This combination of properties makes said polymers suitable for application in adhesive, sealant and coating compositions and in bitumen compositions for road paving and/or roofing, wherein moreover, if desired, relatively large amounts of filler can be incorporated.
  • This combination of properties makes said polymers suitable for application in bitumen compositions for sound deadening and/or vibration damping compositions.
  • a found reduced elastic recovery facilitates vacuum molding of three dimensional sound deadening sheets.
  • those multiarmed radial asymmetric block copolymers [C]4X[BA]2 can be used, containing two poly(styrene)-poly(butadiene), wherein the poly(butadiene) segments of which have a rather broad molecular weight distribution, and four poly(butadiene) or poly(isoprene) arms, having a relatively narrow molecular weight distribution.
  • the intermediate product (INT1) isolated by evaporating the solvent and was analysed by ASTM D 3314, GPC analysis by ASTM D 3536 (see Table I).
  • the reaction mixture was cooled down to 60°C before the reaction sequence was followed by subsequently adding 50 g of butadiene and 3.75 mmol of a second portion of sec-butyl lithium into the reaction mixture. After 5 minutes at 60°C the remaining 86 g of butadiene was dosed to the reactor. The polymerisation was then allowed to proceed for 80 minutes at 60°C. The loose polybutadienyl arms formed were coupled to the remaining coupling side by adding 1.4 ml of diethoxypropane. The coupling reaction was allowed to proceed for another 30 minutes at 60°C
  • the obtained polymer P1 was stabilised with 0.6% ionol and isolated by steam stripping to give white crumbs.
  • the polymer P1 was analysed by ASTM D 3314 and ASTM D3536 (see Table I).
  • a six armed asymmetrical styrene-butadiene blockcopolymer P2 was prepared as in example 1, except that 94 g styrene were added to 6 l cyclohexane at 50°C, after which 9.43 mol sec-butyllithium were added. After the polymerisation was completed, 170 g butadiene were dosed to the same reactor. The polymerisation continued until completion. Hereafter 2.37 mmol of the couppling reagent BTCSE were added. INT2 was sampled at this stage. The reaction sequence was followed by adding 50 g of butadiene to the reaction and 4.72 mmol sec-butyllithium. Hereafter, 186 g of butadiene were dosed to the reactor.
  • the polymer was stabilised and isolated similar to polymer P1.
  • the polymer P2 was analysed by ASTM D 3314 and D 3536 (see Table I).
  • a six armed asymmetrical styrene-butadiene blockcopolymer P3 was prepared as in example 1, except that 72 g styrene were added to 6 l cyclohexane at 50°C, after which 7.25 mol sec-butyllithium were added. After the polymerisation was completed, 362 g butadiene were dosed to the same reactor. The polymerisation continued until completion. Hereafter 1.81 mmol of the coupling reagent BTCSE was added. INT3 was sampled at this stage. The reaction sequence was followed by adding 65 g of butadiene to the reaction and 3.62 mol sec-butyllithium.
  • the polymer was stabilised and isolated similar to polymer P1.
  • the polymer P3 was analysed by ASTM D 3314 and D 3536 (see Table I).
  • a six armed asymmetrical styrene-butadiene blockcopolymer P4 was prepared as in example 1, except that 263 g styrene were added to 6 l cyclohexane at 50°C, after which 8.77 mmol sec-butyllithium were added. After the polymerisation was completed, 158 g butadiene were dosed to the same reactor. The polymerisation continued until completion. Hereafter 2.19 mmol of the coupling reagent BTCSE were added. INT4 was sampled at this stage. The reaction sequence was followed by adding 79 g of butadiene to the reaction and 4.39 mmol sec-butyllithium.
  • the polymer was stabilised and isolated similar to polymer P1.
  • the polymer P4 was analysed by ASTM D 3314 and D 3536.
  • a six armed asymmetrical styrene-butadiene blockcopolymer P5 was prepared as in example 1, except that 143 g styrene were added to 6 l cyclohexane at 50°C, after which 4.76 mmol sec-butyllithium were added. After the polymerisation was completed, 238 g butadiene were dosed to the same reactor. The polymerisation continued until completion. Hereafter 1.19 mmol of the coupling reagent BTCSE were added. INT5 was sampled at this stage. The reaction sequence was followed by adding 50 g of butadiene to the reaction and 2.38 mmol sec-butyllithium. Hereafter, 69 g of butadiene were dosed to the reactor.
  • the polymer was stabilised and isolated similar to polymer P1.
  • the polymer P5 was analysed by ASTM D 3314 and D 3536.
  • first reactor 150 g of styrene were added to 3 l of cyclohexane at 50°C, after which 7.50 mmol sec-butyl lithium were added. The reaction was completed after 40 minutes.
  • second reactor 233 g of butadiene were added to 3 l of cyclohexane at 70°C, after which 15 mmol sec-butyl lithium were added. The polymerisation was allowed to proceed at 70°C for 60 minutes. Then 3.75 mmol of the coupling reagent BTCSE were added and was allowed to react for 10 minutes.
  • reaction sequence was followed by subsequently adding 117 g of butadiene and pumping the content of the first reactor to the second one. After 40 minutes at 70°C the polymerisation was completed and 1.4 mL diethoxypropane were added to allow the coupling reaction to occur. The coupling reaction was allowed to proceed for another 20 minutes at 70°C.
  • the obtained polymer P6 was stabilised with 0.6% Ionol and isolated by steam stripping to give white crumbs.
  • the polymer P6 was analysed by ASTM D 3314 and ASTM D3536 (see Table I).
  • reaction sequence was followed by subsequently adding 216 g of butadiene and pumping the content of the first reactor to the second one. After 45 minutes at 70°C the polymerisation was completed and 1.4 mL diethoxypropane were added to allow the coupling reaction to occur. The coupling reaction was allowed to proceed for another 20 minutes at 70°C.
  • the obtained polymer P7 was stabilised with 0.6% IRGANOX 1010 and isolated by steam stripping to give white crumbs.
  • the polymer P7 was analysed by ASTM D 3314 and ASTM D3536 (see Table I).
  • a six armed asymmetrical styrene-butadiene blockcopolymer CPA was prepared as in example 1, except that 263 g styrene were added to 6 l cyclohexane at 50 ⁇ C, after which 8.77 mol sec-butyllithium were added. After the polymerisation was completed, 158 g butadiene were dosed to the same reactor. The polymerisation continued until completion. Hereafter 2.19 mmol of the couppling reagent BTCSE were added. The intermediate product INTA was sampled at this stage. The reaction sequence was followed by adding 100 g of isoprene to the reaction and 4.39 mmol sec-butyllithium.
  • the polymer was stabilised and isolated similar to polymer P1.
  • the polymer CPA was analysed by ASTM D 3314 and D 3536.
  • first reactor 150 g of styrene were added to 3 l of cyclohexane at 50°C, after which 7.50 mmol sec-butyl lithium were added. The reaction was completed after 40 minutes.
  • second reactor 233 g of butadiene were added to 3 l of cyclohexane at 70°C, after which 15 mmol sec-butyl lithium were added. The polymerisation was allowed to proceed at 70°C for 60 minutes. Then 3.75 mmol of the coupling reagent BTCSE was added and was allowed to react for 10 minutes.
  • reaction sequence was followed by subsequently adding 160 g of isoprene and pumping the content of the first reactor to the second one. After 40 minutes at 70°C the polymerisation were completed and 1.4 mL diethoxypropane were added to allow the coupling reaction to occur. The coupling reaction was allowed to proceed for another 20 minutes at 70°C.
  • the obtained final polymer CPB was stabilised with 0.6% Ionol and isolated by steam stripping to give white crumbs.
  • the polymer CPB was analysed by ASTM D 3314 and ASTM D3536 (see Table I).
  • Table II Polymer properties Polymer Properties D 11861 P1 P6 Melt index [g/10 min]2 0 0 5.0 Tensile strength [MPa] 18.5 10.5 2.0 Modulus 300% [MPa] 3.0 3.1 1.5 Elongation [%] 650 600 330 Hardness [ShA] 80 79 40 Compression set [%] 48 57 25 1
  • KRATON D 1186 Commercially available under tradename KRATON D 1186 and used as comparison. 2 Melt index has been measured at 200°C with a 5 kg load.
  • KRATON is a trademark.
  • Table III Properties of blends of 12% polymer in PX-200 bitumen Polymer D-1186 P1 P6 Polymer structure (SB)4 (SB)4XB2 (SB)2XB4 Properties: Softening point (°C) 121.5 120 100.5 Penetration, 25°C (dmm) 70 73 121 Viscosity at 180°C at shearrate 20s ⁇ 1 (Pa.s) 4.13 3.34 0.35 shearrate 100s ⁇ 1 (Pa.s) 3.74 2.95 0.35 Cold Bend, pass (°C) -25 -30 -25 Flow, pass (°C) 90 90 75 Stress/strain properties Yield stress (105.Pa) 0.61 0.62 0.24 Modulus 500% (105.Pa) 0.90 0.97 0.55 Max.

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EP19950203599 1994-12-23 1995-12-21 Procédé de fabrication de copolymères blocs radiaux asymétriques et à plusieurs bras Expired - Lifetime EP0718330B1 (fr)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1408061A1 (fr) * 2002-10-11 2004-04-14 ATOFINA Research Procédé pour la production d'un copolymère transparent
WO2014001233A1 (fr) * 2012-06-29 2014-01-03 Styrolution GmbH Procédé de fabrication de copolymères séquencés de composés vinylaromatiques et de diènes à structure asymétrique et à ramification en étoile
EP3143056A4 (fr) * 2014-05-16 2018-04-18 Kraton Polymers U.S. LLC Agent de couplage polyalcénylique et polymères de diène conjugué préparés à partir de celui-ci
EP3143057A4 (fr) * 2014-05-16 2018-04-18 Kraton Polymers U.S. LLC Polymère diène conjugué ramifié à distribution de poids moléculaire (mwd) large

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0324992A1 (fr) * 1985-06-18 1989-07-26 Shell Internationale Researchmaatschappij B.V. Composition de polymère bloc et sa méthode de préparation
US5212249A (en) * 1991-10-28 1993-05-18 Shell Oil Company Method for preparing asymmetric radial polymers
WO1994022931A1 (fr) * 1993-03-30 1994-10-13 Shell Internationale Research Maatschappij B.V. Procede de preparation d'une composition de copolymeres sequences, et composition de copolymeres sequences
WO1995013314A1 (fr) * 1993-11-09 1995-05-18 Shell Internationale Research Maatschappij B.V. Copolymeres radiaux asymetriques hydrogenes
US5447995A (en) * 1994-05-27 1995-09-05 Shell Oil Company Method for producing asymmetric radial polymers

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0324992A1 (fr) * 1985-06-18 1989-07-26 Shell Internationale Researchmaatschappij B.V. Composition de polymère bloc et sa méthode de préparation
US5212249A (en) * 1991-10-28 1993-05-18 Shell Oil Company Method for preparing asymmetric radial polymers
WO1994022931A1 (fr) * 1993-03-30 1994-10-13 Shell Internationale Research Maatschappij B.V. Procede de preparation d'une composition de copolymeres sequences, et composition de copolymeres sequences
WO1995013314A1 (fr) * 1993-11-09 1995-05-18 Shell Internationale Research Maatschappij B.V. Copolymeres radiaux asymetriques hydrogenes
US5447995A (en) * 1994-05-27 1995-09-05 Shell Oil Company Method for producing asymmetric radial polymers

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1408061A1 (fr) * 2002-10-11 2004-04-14 ATOFINA Research Procédé pour la production d'un copolymère transparent
US6992136B2 (en) 2002-10-11 2006-01-31 Atofina Research Transparent block copolymers and production thereof
CN100404571C (zh) * 2002-10-11 2008-07-23 道达尔石化费卢依研究公司 透明嵌段共聚物及其制备
WO2014001233A1 (fr) * 2012-06-29 2014-01-03 Styrolution GmbH Procédé de fabrication de copolymères séquencés de composés vinylaromatiques et de diènes à structure asymétrique et à ramification en étoile
CN104395365A (zh) * 2012-06-29 2015-03-04 苯领欧洲股份公司 一种制备不对称型的、星形-支链乙烯基芳香族-二烯嵌段共聚物的方法
CN104395365B (zh) * 2012-06-29 2017-01-18 苯领欧洲股份公司 一种制备不对称型的、星形‑支链乙烯基芳香族‑二烯嵌段共聚物的方法
US9650464B2 (en) 2012-06-29 2017-05-16 Ineos Styrolution Europe Gmbh Method for producing asymmetrically formed, star-branched vinyl aromatic-diene block copolymers
EP3143056A4 (fr) * 2014-05-16 2018-04-18 Kraton Polymers U.S. LLC Agent de couplage polyalcénylique et polymères de diène conjugué préparés à partir de celui-ci
EP3143057A4 (fr) * 2014-05-16 2018-04-18 Kraton Polymers U.S. LLC Polymère diène conjugué ramifié à distribution de poids moléculaire (mwd) large

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